高拱坝深孔窄缝挑坎水舌空中运动特性及抛距计算

The Hydrodynamic Characteristics and Calculation of the Nappe Trajectory Distance from Orifice with Slit-type Bucket in a High-arch Dam

窄缝挑坎应用于高拱坝深孔后,其出射水流内外缘抛距是确定拱坝下游消能水垫塘长度的重要依据。结合窄缝挑坎应用于高拱坝深孔后的水舌空中运动特性,依据几何相似原理和自由抛射体运动原理,建立了其内外缘抛距的计算方法,计算结果同模型试验结果吻合良好。

When the slit-type buckets are applied to the orifices in a high-arch dam,the nappes trajectory distance is basic to the design of the plunge pool. The hydrodynamic characteristics of nappes from orifices with slit-type buckets in a high-arch dam are studied. And based on the geometric similarity and law of free falling body movement,the method of nappes trajectory distance calculation is put forward. The results are in good agreement with those of model test.